linux-kernel - Re: [PATCH v2] extcon: usbc-tusb320: Call the Type-C IRQ handler only if a port is registered

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Date:   Mon, 7 Nov 2022 18:28:22 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Yassine Oudjana <yassine.oudjana@...il.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Marek Vasut <marex@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yassine Oudjana <y.oudjana@...tonmail.com>
Subject: Re: [PATCH v2] extcon: usbc-tusb320: Call the Type-C IRQ handler
 only if a port is registered

On Mon, Nov 07, 2022 at 06:33:17PM +0300, Yassine Oudjana wrote:
> From: Yassine Oudjana <y.oudjana@...tonmail.com>
> 
> Commit bf7571c00dca ("extcon: usbc-tusb320: Add USB TYPE-C support")
> added an optional Type-C interface to the driver but missed to check
> if it is in use when calling the IRQ handler. This causes an oops on
> devices currently using the old extcon interface. Check if a Type-C
> port is registered before calling the Type-C IRQ handler.
> 
> Fixes: bf7571c00dca ("extcon: usbc-tusb320: Add USB TYPE-C support")
> Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
> Reviewed-by: Marek Vasut <marex@...x.de>

Looks good to me. FWIW:

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> Changes since v1:
> - Drop "for backward compatibility" from comment to avoid confusion on
>   whether Type-C is meant to be the old or new interface.
> 
>  drivers/extcon/extcon-usbc-tusb320.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
> index 41041ff0fadb..2a120d8d3c27 100644
> --- a/drivers/extcon/extcon-usbc-tusb320.c
> +++ b/drivers/extcon/extcon-usbc-tusb320.c
> @@ -327,7 +327,13 @@ static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
>  		return IRQ_NONE;
>  
>  	tusb320_extcon_irq_handler(priv, reg);
> -	tusb320_typec_irq_handler(priv, reg);
> +
> +	/*
> +	 * Type-C support is optional. Only call the Type-C handler if a
> +	 * port had been registered previously.
> +	 */
> +	if (priv->port)
> +		tusb320_typec_irq_handler(priv, reg);
>  
>  	regmap_write(priv->regmap, TUSB320_REG9, reg);
>  
> -- 
> 2.38.1

thanks,

-- 
heikki